Matt Usifer

Results 2 issues of Matt Usifer

This PR adds a new consumer function - `get_watermark_offsets` - which leverages the [get_watermark_offsets](https://docs.confluent.io/platform/current/clients/librdkafka/html/classRdKafka_1_1Handle.html#ab37fddad61506c8749214f1f009d17ca) librdkafka binding to return the _last known_ watermark values for a topic/partition. This is essentially a...

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